Engineering Thermodynamics
For the same compression ratio, the efficiency of dual combustion cycle is

Less than Diesel cycle and greater than Otto cycle
Greater than Diesel cycle and less than Otto cycle
Less than Diesel cycle
Greater than Diesel cycle

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Engineering Thermodynamics
Which of the following is the correct statement of the second law of thermodynamics?

It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
All of these
There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy

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